Convection developed during the afternoon across central Ohio ahead of a southward sagging frontal boundary. Some of these storms became severe by the late afternoon and early evening hours.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ILN wrote it up.
Convection developed during the afternoon across central Ohio ahead of a southward sagging frontal boundary. Some of these storms became severe by the late afternoon and early evening hours. The main threat from these storms was damaging thunderstorm winds.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Wilmington, OH wrote its last area forecast discussion before the first event at Jul 29, 3:00 PM EST, 2 hours 54 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
400 PM EDT FRI JUL 29 2011
.SYNOPSIS...
A COLD FRONT WILL DROP THROUGH THE REGION TONIGHT...BRINGING
SCATTERED SHOWERS AND THUNDERSTORMS. HIGH PRESSURE WILL TRY AND
BUILD IN FROM THE NORTH ON SATURDAY...BUT A CHANCE OF
THUNDERSTORMS WILL LINGER ON SATURDAY ACROSS SOUTHERN OHIO INTO
KENTUCKY. THE HIGH WILL HAVE SETTLED ACROSS ALL OF THE REGION BY
SUNDAY.
&&
.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
AREA OF CONVECTION IS MOVG THRU CENTRAL OH ATTM. 16Z RUC SHOWED
THIS WELL AND FOLLOWED IT WITH A LULL THRU 21Z...WITH ADDITIONAL
CONVECTION FORMING IN THE NW COUNTIES AFT 21Z. WENT AHEAD AND FOLLOWED THIS
SCENARIO. WENT LIKELY FOR THE EARLY EVENING FROM RID-DAY-CMH. AS FNT
PUSHES S...TNGT SCT TSTM SHOULD WORK S THRU THE FA. KEPT POPS IN
THE CHC CATEGORY FOR SRN LOCATIONS.
STILL SEEING SOME LOCATIONS WITH HI OVER 100...SO WILL ALLOW THE
HEAT HEADLINES TO CONTINUE UNTIL 8 PM.
LEANED TOWARD THE SLIGHTLY WARMER ECMWF TEMPS FOR LOWS TNGT. THIS
PUT MOST LOCATIONS IN THE LOWER 70S AND THE EXTREME E IN THE UPPER 60S.
&&
.SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
MODEL CONSENSUS PUTS THE FNT IN THE VICINITY OF THE OHIO RIVER BY
12Z SATURDAY. SCT CONVECTION SHOULD POP AGAIN IN THE HEAT OF THE
DAY FROM ABOUT I-70 SWD...WITH THE BEST POPS ALONG THE RIVER. AS
HIGH BUILDS IN FROM THE N DURING THE DAY...THE CHC OF PCPN WILL
DIMINISH FROM N TO S.
AN ISOLATED TSTM MIGHT LINGER INTO EARLY SATURDAY EVENING IN THE
S...SO HELD ONTO A 20 POP...BUT ALL CONVECTION SHOULD BE GONE BY
MIDNIGHT.
WENT WITH A MODEL BLEND FOR HIGHS SATURDAY...PUTTING EVERYONE IN
THE UPPER 80S. HEAT INDICES WILL BE BELOW ADVISORY/WARNING
THRESHOLDS ON SATURDAY...SO NO HEAT HEADLINES.
&&
.LONG TERM /SUNDAY THROUGH FRIDAY/...
EXTENDED PERIOD WILL START OFF DRY AS AN UPPER LEVEL HIGH PRESSURE
RIDGE BUILDS INTO THE OHIO VALLEY REGION. WED A SHORT WAVE MOVES
THROUGH THE FLOW AROUND THE UPPER LEVEL RIDGE BRINGING THE CHANCE OF
THUNDERSTORMS TO THE REGION AGAIN. ANOTHER STRONGER UPPER LEVEL
SHORT WAVE WILL MOVE ACROSS THE REGION THURSDAY INTO FRIDAY. AT THE
SURFACE...A COLD FRONT MOVES INTO THE OHIO VALLEY WED THEN STALLS IN
THE REGION THU AND WEAKENS. A SURFACE LOW DEVELOPS WEST OF THE
REGION ON FRIDAY...CONTINUING THE CHANCE FOR THUNDERSTORMS. WILL BE
DIFFICULT TO TIME PRECIPITATION BUT BEST CHANCE LOOKS TO BE ON WED
AND FRI. WITH SOME DIFFERENCES IN MODELS...THU MAY ACTUALLY TURN OUT
TO BE A DRY DAY.
HIGH TEMPERATURES WILL CONTINUE TO BE AROUND 90 OR INTO THE LOW 90S
MOST PLACES BUT WILL BEGIN TO COOL A FEW DEGREES BY THU. FRIDAY WILL
BE THE COOLEST DAY OF THE EXTENDED PERIOD WITH HIGHS RANGING FROM
THE MID TO UPPER 80S IN THE NORTH TO AROUND 90 IN THE SOUTH.
&&
.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
THUNDERSTORMS WILL DEVELOP ALONG AND AHEAD OF A FRONTAL BOUNDARY
THAT WILL BEGIN TO AFFECT THE NORTHERN TAF SITES LATE THIS
AFTERNOON. HAVE PLACED MVFR CONDITIONS IN THUNDERSTORMS FROM
AROUND 21Z TO 02Z ACROSS ALL TAF SITES WITH THE EXCEPTION OF
CVG/LUK. AT CVG/LUK ENOUGH UNCERTAINTIES STILL EXIST AS FAR AS
TIMING IS CONCERNED TO KEEP JUST CB IN THE FORECAST FOR NOW. MOST
ACTIVITY WILL TAPER OFF AFTER 06Z...AND WILL LIKELY BE SOUTH OF
CMH/LCK/DAY BY 03Z. ADDITIONAL THUNDERSTORM DEVELOPMENT WILL BE
POSSIBLE SATURDAY ACROSS THE SOUTHERN TAF SITES CVG/LUK WITH THE
FRONTAL BOUNDARY IN THE VICINITY.
&&
.ILN WATCHES/WARNINGS/ADVISORIES...
OH...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR OHZ053>056-060-
062>065-070>074-078>082-088.
EXCESSIVE HEAT WARNING UNTIL 8 PM EDT THIS EVENING FOR OHZ061-
077.
KY...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR KYZ089>100.
IN...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR INZ050-058-059-
066-073>075-080.
&&
SYNOPSIS...SITES
NEAR TERM...SITES
SHORT TERM...SITES
LONG TERM...PARKER
AVIATION...LATTOHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 609 AM EDT FRI JUL 29 2011 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ053>056-060-062>065- 070>074-078>082-088-301015- WAYNE-FAYETTE IN-UNION IN-FRANKLIN IN-RIPLEY-DEARBORN-OHIO- SWITZERLAND-CARROLL-GALLATIN-BOONE-KENTON-CAMPBELL-OWEN-GRANT- PENDLETON-BRACKEN-ROBERTSON-MASON-LEWIS-CLARK-MADISON-FRANKLIN OH- LICKING-PREBLE-GREENE-FAYETTE OH-PICKAWAY-FAIRFIELD-BUTLER-WARREN- CLINTON-ROSS-HOCKING-CLERMONT-BROWN-HIGHLAND-ADAMS-PIKE-SCIOTO- 609 AM EDT FRI JUL 29 2011 ...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL INDIANA...SOUTHEAST INDIANA...NORTHEAST KENTUCKY...NORTHERN KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL OHIO AND SOUTHWEST OHIO. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. HEAT ADVISORY. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP LATE THIS AFTERNOON INTO THIS EVENING. A FEW SEVERE THUNDERSTORMS WILL BE POSSIBLE...WITH THE PRIMARY THREAT OF DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. OHZ061-077-301015- MONTGOMERY-HAMILTON- 609 AM EDT FRI JUL 29 2011 ...EXCESSIVE HEAT WARNING IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIAMI VALLEY OF OHIO AND SOUTHWEST OHIO. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. EXCESSIVE HEAT WARNING. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE AFTERNOON INTO THE EVENING. A FEW SEVERE THUNDERSTORMS WILL BE POSSIBLE...WITH THE PRIMARY THREAT OF DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. OHZ026-034-035-042>046-051-052-301015- HARDIN-MERCER-AUGLAIZE-DARKE-SHELBY-LOGAN-UNION OH-DELAWARE-MIAMI- CHAMPAIGN- 609 AM EDT FRI JUL 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL OHIO...MIAMI VALLEY OF OHIO AND WEST CENTRAL OHIO. .DAY ONE...TODAY AND TONIGHT. HOT AND HUMID CONDITIONS WILL CONTINUE ON FRIDAY...WITH HEAT INDICES BETWEEN 95 AND 100 DEGREES. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE DAY ON FRIDAY. A FEW SEVERE THUNDERSTORMS WILL BE POSSIBLE...WITH THE PRIMARY THREAT OF DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
239 PM EDT FRI JUL 29 2011
OHZ046-056-291945-
DELAWARE OH-LICKING OH-
239 PM EDT FRI JUL 29 2011
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN LICKING AND
DELAWARE COUNTIES THROUGH 345 PM EDT...
AT 235 PM EDT...RADAR INDICATED A STRONG THUNDERSTORM NEAR
DELAWARE...MOVING EAST AT 20 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...SUNBURY AND JOHNSTOWN.
ALSO...LEONARDSBURG...LEWIS CENTER...KILBOURNE...ALUM CREEK STATE
PARK...GALENA...OLIVE GREEN...CENTER VILLAGE AND HARTFORD ARE NEAR
THE PATH OF THIS STRONG THUNDERSTORM.
LAT...LON 4010 8263 4022 8317 4039 8313 4038 8292
4036 8292 4035 8275 4035 8274 4028 8274
4027 8259
ASLSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
344 PM EDT FRI JUL 29 2011
OHZ056-292015-
LICKING OH-
344 PM EDT FRI JUL 29 2011
...A STRONG THUNDERSTORM WILL AFFECT LICKING COUNTY THROUGH 415 PM
EDT...
AT 339 PM EDT...RADAR INDICATED A STRONG THUNDERSTORM NEAR
HARTFORD...MOVING EAST AT 35 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...JOHNSTOWN...GRANVILLE
SOUTH...GRANVILLE...UTICA...HEATH...NEWARK AND HANOVER.
ALSO...HARTFORD...ALEXANDRIA...ST. LOUISVILLE AND FALLSBURG ARE NEAR
THE PATH OF THIS STRONG THUNDERSTORM.
RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT. IF THIS STORM BECOMES
STRONGER...THEN A WARNING MAY BE NEEDED.
LAT...LON 3998 8220 4006 8277 4028 8275 4026 8247
4025 8247 4025 8224 4024 8218SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
622 PM EDT FRI JUL 29 2011
OHZ051>053-292245-
CHAMPAIGN OH-CLARK OH-MIAMI OH-
622 PM EDT FRI JUL 29 2011
...A STRONG THUNDERSTORM WILL AFFECT MIAMI...NORTHWESTERN CLARK AND
SOUTHWESTERN CHAMPAIGN COUNTIES THROUGH 645 PM EDT...
AT 620 PM EDT...RADAR INDICATED A STRONG THUNDERSTORM NEAR TROY...
MOVING EAST AT 40 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...TIPP CITY...NEW
CARLISLE AND ENON.
ALSO...GINGHAMSBURG...CASSTOWN...GRAYSON...HAVEN VIEW...
CHRISTIANSBURG...BRANDT...BROWN AND PARK LAYNE ARE NEAR THE PATH OF
THIS STRONG THUNDERSTORM.
LAT...LON 4008 8385 3984 8394 3991 8417 3992 8416
3992 8423 3997 8439 4016 8442SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
647 PM EDT FRI JUL 29 2011
OHZ051>053-292315-
CHAMPAIGN OH-CLARK OH-MIAMI OH-
647 PM EDT FRI JUL 29 2011
...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MIAMI...WESTERN
CLARK AND SOUTHWESTERN CHAMPAIGN COUNTIES THROUGH 715 PM EDT...
AT 645 PM EDT...RADAR INDICATED A STRONG THUNDERSTORM NEAR GRAYSON...
MOVING EAST AT 15 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.
IN ADDITION...HEAVY RAIN CAN BE EXPECTED WITH THIS STORM.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...NEW CARLISLE AND
SPRINGFIELD.
ALSO...HAVEN VIEW...BRANDT...BROWN...CHRISTIANSBURG...DIALTON...NORTH
HAMPTON...THACKERY AND BUCK CREEK STATE PARK ARE NEAR THE PATH OF
THIS STRONG THUNDERSTORM.
WATER WILL POND ON ROADS AND MAY QUICKLY FILL ROADSIDE DITCHES AND
SMALL STREAMS.
LAT...LON 4004 8369 3984 8379 3992 8416 3992 8419
3993 8424 4011 8418SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
650 PM EDT FRI JUL 29 2011
OHZ053-054-292315-
CLARK OH-MADISON OH-
650 PM EDT FRI JUL 29 2011
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL MADISON AND EASTERN
CLARK COUNTIES THROUGH 715 PM EDT...
AT 648 PM EDT...RADAR INDICATED A STRONG THUNDERSTORM NEAR
BRIGHTON...MOVING EAST AT 20 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.
IN ADDITION...HEAVY RAIN CAN BE EXPECTED WITH THIS STORM.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...CHOCTAW LAKE...LONDON
AND JEFFERSON.
ALSO...LAFAYETTE...BIG PLAIN...LILLY CHAPEL AND MADISON LAKE ARE NEAR
THE PATH OF THIS STRONG THUNDERSTORM.
WATER WILL POND ON ROADS AND MAY QUICKLY FILL ROADSIDE DITCHES AND
SMALL STREAMS.
LAT...LON 3997 8325 3994 8323 3993 8323 3992 8325
3981 8324 3975 8325 3982 8367 3999 8364The Cincinnati radar (KILN), 59 km away, was scanning. The volume nearest the first event began at 22:54 UTC.
3 thunderstorm wind, 1 heavy rain. Local standard time, as filed.
A couple of trees were reported down due to damaging thunderstorm winds.
Large tree limbs were reported down due to damaging thunderstorm winds.
High water was reported on a road due to heavy rain.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2011Every state in 2011This day in weather historyWarnings in Ohio, July 2011
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 330338, 330339, 330340, 330337.